Display Email Attachment Sizes In Thunderbird

Many email providers only accept email attachments up to a specific limit size-wise. The maximum size limit is different for most providers and can range from a Megabyte to 20 or 25 Megabytes, which is supported by email providers such as Yahoo Mail and Gmail.
Since limits exist, it is important to know the total size of all files attached to emails to avoid having it rejected by the provider. If the limit is exceeded, emails will bounce so that you will have to deal with the issue then and the delay that is caused by it.
Note: Some providers and emails clients support using file hosting services to overcome the limit. Gmail lets you use Google Drive to attach files of any size to emails. What happens is that links are placed in emails instead of the actual files, so that users need to download the files manually after the email arrives in the inbox.
Displaying email attachment sizes can also be helpful for users who want to reduce the size of their mailbox.
Attachment Sizes
Attachment Sizes is an add-on for the Thunderbird email client that adds size information to all attachments of emails listed by the client.
The file size is displayed next to each file so that its usually easy to determine the overall size of all attachments. The total size of all attachments is displayed when hovering the mouse cursor over the attachment area in the email client.
This does however only work when sending emails, not when the email has already been received. But the total size is not nearly as important in that case.
Attachment Sizes is compatible with all Thunderbird 3.x clients. It can be downloaded from the Mozilla Thunderbird add-on repository.
Update: The Thunderbird add-on is no longer necessary, as Thunderbird displays the size of attachments by default.
Thunderbird displays the size of any attachment that you add to an email directly on the screen.
It furthermore displays a total size summary on the same page, which should provide you with the necessary information you need to decide whether the email potentially exceeds the attachment limit of the email provider.
Thunderbird displays a warning if it suspects that the total size of attachments is too large suggesting to use one of the integrated file services instead.
The size of attachments is also displayed in the case of received emails. This again includes sizes for each individual file, and the total size of all mail attachments.


You said that Outlook isn’t your main email client, so which is your main one?
I think its thunderbird
It is Mozilla Thunderbird.
Awesome! This actually solved my problem… what a stupid bug.
If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.
THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!
Solved my issue! 6 years later and this is still problem…
Fantastic. Thank you. Size did the trick.
This solved my Outlook problem, too. Thank you. :)
Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.
You are a god – thank you!
thanks a lot…. work like charm.. :-)
Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers
Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
Thank you
Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)
Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.
I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!
Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007
Great tip! Thanks!
Worked for me, too – thank you!!!
It’s Worked for me, too
thank you very much!
I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!
Thank you so much. Solved!
Considering you published this in 2012, incredible not been debugged by Microsoft.
Thank you again. M
This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.
Thanks.
Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.
Thank you, this worked !!!!
Man, you are a fucking god. Thanks a lot, what an annoying bug!!
Awesome, this post solved the issue. Many thanks!